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Scientists core into California's Clear Lake to explore past climate change
Date:5/3/2012

ey plans to obtain cores, in the upper arm of the lake about 1-3 miles west southwest of the town of Lucerne, the USGS obtained a continuous core in 1973 going back 130,000 years.

Looy and her team hired Utah-based DOSECC (Drilling, Observation and Sampling of the Earths Continental Crust), a non-profit scientific drilling company, to obtain two 120 meter-long (400-foot) cores, each about 8 centimeters (3 inches) in diameter. The cores are obtained in 3-meter (10-foot) chunks that are capped and labeled at the site and will be shipped to a cold-storage facility in Minnesota operated by LacCORE (National Lacustrine Core Facility), a non-profit organization funded by the National Science Foundation and the University of Minnesota. In the facility's cold lab, the team will split each chunk longitudinally, photograph the halves, and then bring one half of each chunk back to UC Berkeley for analysis.

While the USGS sampled its cores once every meter, Looy and her team will sample parts of their cores every centimeter, the equivalent of about 10 years of sediment.

"We will get 100 times better time resolution, and can follow what happens when you rapidly warm the Earth up," Looy said.

"The detail we can get from Clear Lake is really impressive," she added. "The material is well preserved, and the USGS did a great job in describing the whole time interval so that now we know what the interesting areas are to focus on. We know this is not a shot in the dark."


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Contact: Robert Sanders
rsanders@berkeley.edu
510-643-6998
University of California - Berkeley
Source:Eurekalert

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